Excavator



Nov. 13 1923.

P. BURKE EXCAVATOR Filed Nov. 27,

INVENTOR.

I UL .50/F/(E o L ioa A TTORNEY.

Patented Nov. 13, 1923.

' WED STAT PAUL BURKE, OF GREEN BAY, WISCONSIN.

EXCAVATOR.

Application filed November 27, 1922. Serial No. 603,536.

To all wlwm it may concern Be it known that 1, PAUL BURKE, a citizen ofthe United States of America, and a resident of the city of Green Bay,Brown County, \Visconsin, have invented certain new and usefulImprovements in Excavators, of which the following is a specificatlon.

My invention relates particularly to excavators of the type known asmodified drag line where the bucket or dipper that does the excavatingis carried by a handle which is mounted on a boom and is operated towardthe machine by the pull of the drag line. The handle and boom are somounted and connected that the dipper may be raised and lowered andswung from side to side so that the dipper can assume a variety ofpositions.

One of the objects of my invention is to permit of the use of this typeof excavator in connection with a dipper having a hinged.

door adapted to be closed by the drag line. Where such a dipper is usedin connection with the type of excavator referred to, unless restrainingmeans are used to limit the outward swinging of the dipper handlerelative to the boom, the paying out of the drag line after the diggingoperation is completed will result in movement of the dipper handleoutward without. opening the door until a position of equilibrium isattained. The operator thus has no control over the point at whichdumping will start. It is one of the objects of my invention to providemeans whereby the operator may definitely predetermine the point atwhich dumping shall start.

Carrying further the operation described,

a complete slacking of the drag line results.

in dumping the dipper contents, the release of which effects aprogressive reduction inthe weight of the dipper so that by the time(lumping is completed the dipper and dipper handle will have moved acertain distance beyond their position at the -moment of startingdumping. It is thus impossible to confine the dumping of material to arethat adhesive material, such as clay or gumbo and the like will becleared therefrom without changing the elevation or position of thedipper and dipper handle.

It is a further object of my invention to provide simple and effectivemeans for the release of the latching mechanism which are substantiallyunalfected by the angular movement of the dipper handle and (or) boomand to provide means that will make said latch releasing mechanism coactwith the means employed to restrain the boom from outward movement, thussimplifying manual control.

In the accompan ing drawings:

Figure 1 is a side elevation of a power operated modified drag lineexcavator embodying the principles of my invention; and

Figure 2 is a plan View of the automatic drutn, part thereof being shownsolid and part in section.

As is illustrated, the excavator is of the form in which the boom 1 isrotatably mounted on a pivot 2 and carries a pivot 3 on which is mounteda dipper handle 4. The dipper handle 4 carries a dipper 5 comprising abodV portion 5 and a hinged bottom 7 which is carried by the pivot 8.

The dipper handle is raised and extended outwardly by the hoisting line9 and the dipper is operatedthrough the digging cycle by the drag line10 which is attached to the up er end of the door 7 as shown. The door 7is held normally closed by the latch 11 and this in turn is operated bythe trip line 12 which passes over the sheaves 13, 14, and 15 and isdead-ended on the lever 16. This lever I have shown in the form of apedal but it may be adapted for either manual or pedal control.

The dipper handle is also provided with a holding line 17 which isattached to the lower portion ofthe dipper handleas shown and isdead-ended on an automatic drum 18. This automatic drum is shown more inde- .tail in Fig. 2 and consists of three drums 19,

so that it may be swung in a horizontal lane and is operated by a steamengine or any other prime mover.

In operation the boom is first raised and the dipper extended. bypulling on the hoisting line and paying out on the drag llne, thebottom. having been previously closed to assume the position shown bythe full lines in Fig. 1. The dipper is then lowered to contact with thematerial to be excavated by paying out on the hoisting line 9 and thedigging is done by slacking off on the.

hoisting line and drawing the bucket toward the machine by the drag line10. As soon as the dipper is full or has completed its cycle, it,together with the handle and boom, are raised by hoisting on the hoist-Eng line While keeping tension on the drag line, the boom is swungaround to the place at which the material is desired to be dumped. theoperator depresses the lever 16 which operates to release the. latch andsimultaneously clamps the brake band around the brake drum and thereforelocks the holding line against movement. This releases the latch, thedoor opens and assumes the position shown in dotted lines in Fig. 1, andallows the material to be deposited free of the dipper. By reasonpf thelocking of the drum and holding line it is impossible for the dipperhandle to move and it retains its position while dumping. If it were notfor this line the weight of the dipper, the dipper handle and boomacting on the hoisting line would operate to lower the boom and extendthe dipper handle and the material would not be deposited where desired.If the material is of a sticky nature and does not promptly clear fromthe bucket. the door may be reciprocatcd or even caused to slamviolently against the dipper by intermittent pulls on the drag line.

After the material is dumped, tension is put on the drag line so thatthe door is again made to assume the position shown in full lines inFig. l, the lever is released, which releases the tension on the holdingline, and allows the latch to assume its normal position, holding thedoor closed. The hoistinf; line is then paid out until the dipper is incontact with the earth and the cycle is repeated.

It will be noted that the holding line is never slack, being kept tautby the counterweight acting on theautomatic drum as shown.

If desired. variations of form or mechanism may be used, as for example,I may dispense with the latch and rely upon the located on theoutwardmost end thereof instead of on the bottom asshown, and othervariations may be made to accomplish the results which are desired to beaccomplished, and I do not want to be understood as limiting myinvention to the specific form of mechanism shown excepting in thoseclaims wherein it is so distinctly claimed and described.

Having fully described my invention, I claim:

1. A device of the class described comprising a boom, a dipper handlepivotally mounted thereon and carrying a dipper, a hoisting lineattached to the dipper handle, adipper door pivotally connected to thedipper, a drag line operatively connected tothe dipper door, a latch,and means for simultaneously releasing the latch and preventing motionof the dipper handle.

2. A device of the class described comprising a boom, a dipper handlepivotally mounted thereon and carrying a dipper, a hoisting lineattached to the dipper handle, a dipper door pivotally connected to thedipper, a drag line operatively connected to the dipper door, and aholding line attached to the dipper handle.

3. A device of the class described comprising a boom, a dipper handlepivotally mounted thereon and carrying a dipper, a hoisting lineattached to the dipper handle, a dipper door pivotally connected to thedipper, a drag line operatively connected to the dipper door, a latch, aholding line, a latch line, and a lever for simultaneously operating theholding line and latch line.

4. A device of the class described comprising a boom, a dipper handlepivotally mounted thereon and carrying a dipper, a hoisting lineattached to the dipper handle, a dipper door pivotally connected to thedipper, a drag line operatively connected to the dipper door, a latch. aholding line, a latch line and an automatic drum on which the holdingline is wound, means for keeping the holding line taut, a brake band forbraking the automatic drum, sheaves mounted. on the boom substantiallycoincident with the pivotal centers thereof and over which the latchline passes, and a lever for simultaneously locking the brake andreleasing the latch.

PAUL BURKE.

